Q7 of 71 Page 204

Calculate the mean of the following frequency distribution:

Here first we’ll find the class marks -



We’ll first assume a mean A = 65 and here h = 55 - 45 = 10.


Now we’ll find the ui



Now,


Where, = Mean, ui = calculated values of x and fi = frequency for that x.





⇒ = 68.56


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5

By taking the assumed mean as 25, find the mean of the following distribution:

 6

The given table shows the age distribution of patients suffering from a disease in a city in a particular year. Find the mean age (in years) of the patients.

 1

Find the median of the following values of the variable:

25, 34, 33, 13, 20, 26, 36, 28, 19, 34

 2

Find the median of the following numbers—

19, 25, 59, 48, 35, 31, 30, 32, 51


If 25 is replaced by 52, then find the new median.